我正在使用 asp.net mvc3。我正在通过 system.drawing 使用文本制作位图。我要
将该图像从我的 Controller 发送到我在 VIEWDATA 中的 View ,但在我看来我无法正确解析 VIEWDATA。
这是 Controller 代码:
public ActionResult About( string agha)
{
agha = "asgdjhagsdjgajdga";
Color BackColor = Color.White;
String FontName = "Times New Roman";
int FontSize = 25;
int Height = 50;
int Width = 700;
Bitmap bitmap = new Bitmap(Width, Height);
Graphics graphics = Graphics.FromImage(bitmap);
Color color = Color.Gray; ;
Font font = new Font(FontName, FontSize);
SolidBrush BrushBackColor = new SolidBrush(BackColor);
Pen BorderPen = new Pen(color);
Rectangle displayRectangle = new Rectangle(new Point(0, 0), new Size(Width - 1, Height - 1));
graphics.FillRectangle(BrushBackColor, displayRectangle);
graphics.DrawRectangle(BorderPen, displayRectangle);
graphics.DrawString(agha,font,Brushes.Red, 0, 0);
ViewData["picture"] = bitmap;
return View( );
}
调用 View 数据的 View 看起来像这样
<img src="@ViewData["picture"]." />
最佳答案
我建议您编写一个自定义操作结果,以避免用完全无用且乏味的 GDI+ 基础结构代码污染您的 Controller 操作:
public class ImageResult : ActionResult
{
private readonly string _agha;
public ImageResult(string agha)
{
_agha = agha;
}
public override void ExecuteResult(ControllerContext context)
{
Color BackColor = Color.White;
String FontName = "Times New Roman";
int FontSize = 25;
int Height = 50;
int Width = 700;
using (Bitmap bitmap = new Bitmap(Width, Height))
using (Graphics graphics = Graphics.FromImage(bitmap))
{
Color color = Color.Gray;
Font font = new Font(FontName, FontSize);
SolidBrush BrushBackColor = new SolidBrush(BackColor);
Pen BorderPen = new Pen(color);
Rectangle displayRectangle = new Rectangle(new Point(0, 0), new Size(Width - 1, Height - 1));
graphics.FillRectangle(BrushBackColor, displayRectangle);
graphics.DrawRectangle(BorderPen, displayRectangle);
graphics.DrawString(_agha, font, Brushes.Red, 0, 0);
context.HttpContext.Response.ContentType = "image/jpg";
bitmap.Save(context.HttpContext.Response.OutputStream, ImageFormat.Jpeg);
}
}
}
然后简单地定义一个将返回此自定义操作结果的 Controller 操作:
public class HomeController : Controller
{
public ActionResult Index()
{
return View();
}
public ActionResult Image(string agha)
{
return new ImageResult(agha);
}
}
并且在某些 View 中(在我的示例中为 ~/Views/Home/Index.cshtml
),您可以引用将为您动态生成图像的操作:
<img src="@Url.Action("Image", new { agha = "foo bar" })" alt="" />
如果您不想创建额外的操作来构建图像,另一种可能性是使用 Data URI scheme它基本上允许您将图像作为 Base64 数据直接嵌入到 HTML 中。需要注意的是,并非所有浏览器都支持它,除此之外,它会使您的 HTML 页面变得更大。
关于c# - 从 Controller 发送图像以在 MVC3 中查看,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8923817/